Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.118423-11
S. Tanuja, J. C. Jeeva, E. Rout
One of the determinants of consumer demand for any value added product especially that of a perishable item like fish/shrimp is its shelf life. Pickling has long since been one of the effective ways to preserve perishable foods for the lean season. The present study was designed to assess the biochemical and microbiological quality of shrimp pickle stored at room temperature and refrigerated temperature (4oC). The recipe for preparation of the product was decided based on the consumer preference of the region. The pH, which is considered as the most important criterion determining the shelf life in pickle, remained below 5 in both the treatments throughout the storage period of six months (p=0.053). All the biochemical parameters except total volatile nitrogen (TVN), remained with in the acceptable limit throughout the storage period in both the treatments, although the values were low for pickle stored at refrigerated temperature. There was no significant difference in TVBN value of pickle stored at refrigerated and room temperature at the end of six months (p=0.072). The TVN value did not correlate with organoleptic evaluation of the pickles stored at both room temperature and refrigerated condition. As per the organoleptic evaluation, the pickles were in acceptable level even after six months of storage and the sensory quality was not significantly different between the two treatments (p=0.225). Consumers perceived taste, price, appearance and health factor as the most important attributes that would determine the acceptability of a product. Keywords: Consumer perception, Food preservation, Seafood, Value added product
{"title":"Comparative storage stability of shrimp (Metapenaeus spp.) pickle at room temperature and refrigerated temperature","authors":"S. Tanuja, J. C. Jeeva, E. Rout","doi":"10.21077/ijf.2022.69.4.118423-11","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.118423-11","url":null,"abstract":"One of the determinants of consumer demand for any value added product especially that of a perishable item like fish/shrimp is its shelf life. Pickling has long since been one of the effective ways to preserve perishable foods for the lean season. The present study was designed to assess the biochemical and microbiological quality of shrimp pickle stored at room temperature and refrigerated temperature (4oC). The recipe for preparation of the product was decided based on the consumer preference of the region. The pH, which is considered as the most important criterion determining the shelf life in pickle, remained below 5 in both the treatments throughout the storage period of six months (p=0.053). All the biochemical parameters except total volatile nitrogen (TVN), remained with in the acceptable limit throughout the storage period in both the treatments, although the values were low for pickle stored at refrigerated temperature. There was no significant difference in TVBN value of pickle stored at refrigerated and room temperature at the end of six months (p=0.072). The TVN value did not correlate with organoleptic evaluation of the pickles stored at both room temperature and refrigerated condition. As per the organoleptic evaluation, the pickles were in acceptable level even after six months of storage and the sensory quality was not significantly different between the two treatments (p=0.225). Consumers perceived taste, price, appearance and health factor as the most important attributes that would determine the acceptability of a product. Keywords: Consumer perception, Food preservation, Seafood, Value added product","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48893367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.127612-07
A. Pathak, Ganesan Kantharajan, R. Dayal, Ravi Kumar, V. P. SAINI, V. Mohindra, K. Lal
Luni is an ephemeral and inland saline river flowing through the Thar Desert of India. The present study focusses on the length-weight relationships (LWRs) and condition factor analysis of six native and one invasive alien fish species (Oreochromis mossambicus) collected from the river Luni during the exploratory surveys conducted from October, 2018 to September, 2020. LWRs of native fish species showed negative allometric growth for Aphanius dispar, Cirrhinus mrigalaand Salmostoma bacaila and positive allometric growth for Labeo rohita, Mystus gulio and Systomus sarana. Despite abundant distribution of O. mossambicus in the middle and downstream segments of the river Luni, this study revealed good wellbeing and suitability of this river to native and non-native fish species. This forms the first study that reports the LWRs and Kn value of these fish species from the river Luni, which could be useful for estimating stock characteristics and future evaluation of fish population in this dynamic and fragile ecosystem. Further, results of the present study were also compared with the available literature from nearby and associated ecosystems. The baseline information generated will be helpful in understanding the present status of the fish population and also to carryout ecological studies for their conservation and management in the future.Keywords: Invasive Alien Species, Length-weight relationship, Oreochromis mossambicus, Thar Desert
{"title":"Length-weight relationships and relative condition factor of fish species dwelling in the inland saline river, Luni, India, with a note on the associated risks and encounters obstructing the fish diversity and ecosystem services","authors":"A. Pathak, Ganesan Kantharajan, R. Dayal, Ravi Kumar, V. P. SAINI, V. Mohindra, K. Lal","doi":"10.21077/ijf.2022.69.4.127612-07","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.127612-07","url":null,"abstract":"Luni is an ephemeral and inland saline river flowing through the Thar Desert of India. The present study focusses on the length-weight relationships (LWRs) and condition factor analysis of six native and one invasive alien fish species (Oreochromis mossambicus) collected from the river Luni during the exploratory surveys conducted from October, 2018 to September, 2020. LWRs of native fish species showed negative allometric growth for Aphanius dispar, Cirrhinus mrigalaand Salmostoma bacaila and positive allometric growth for Labeo rohita, Mystus gulio and Systomus sarana. Despite abundant distribution of O. mossambicus in the middle and downstream segments of the river Luni, this study revealed good wellbeing and suitability of this river to native and non-native fish species. This forms the first study that reports the LWRs and Kn value of these fish species from the river Luni, which could be useful for estimating stock characteristics and future evaluation of fish population in this dynamic and fragile ecosystem. Further, results of the present study were also compared with the available literature from nearby and associated ecosystems. The baseline information generated will be helpful in understanding the present status of the fish population and also to carryout ecological studies for their conservation and management in the future.Keywords: Invasive Alien Species, Length-weight relationship, Oreochromis mossambicus, Thar Desert","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46491600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.117646-18
K. Chakraborty, Soumya Krishnan, R. Chakraborty, Aswathy Elizabeth Mani, P. Vijayagopal
Seasonal variations of the fatty acid profile of deep-sea whip lobster Puerulus sewelli (Decapoda, Palinuridae), harvestedfrom the south-west coast of India were compared. Fatty acid contents showed seasonal fluctuations, with eicosapentaenoicacid and docosahexaenoic acid being predominant during the post-monsoon and winter seasons (9-11% of cumulative fattyacids). P. sewelli was found to possess considerably higher C20-22 n-3 fatty acids during these seasons along with balancedn-3/n-6 (>2) and polyunsaturated/saturated fatty acid ratio (≥1) than those in pre-monsoon. Greater hypocholesterolemic/hypercholesterolemic ratio (>2.4) and lesser atherogenicity (<1.8) and thrombogenicity (<0.3) indices qualify P. sewelli anideal health food. This study comprises the first report on fatty acid profile from commercially important deep-sea whiplobster P. sewelli. Keywords: Atherogenicity index, Non-conventional resource, Polyunsaturated fatty acid, Seafood benefits, Thrombogenicity index
{"title":"Seasonal variation of fatty acid profile in edible tissue of deep-sea whip lobster Puerulus sewelli (Decapoda, Palinuridae)","authors":"K. Chakraborty, Soumya Krishnan, R. Chakraborty, Aswathy Elizabeth Mani, P. Vijayagopal","doi":"10.21077/ijf.2022.69.4.117646-18","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.117646-18","url":null,"abstract":" Seasonal variations of the fatty acid profile of deep-sea whip lobster Puerulus sewelli (Decapoda, Palinuridae), harvestedfrom the south-west coast of India were compared. Fatty acid contents showed seasonal fluctuations, with eicosapentaenoicacid and docosahexaenoic acid being predominant during the post-monsoon and winter seasons (9-11% of cumulative fattyacids). P. sewelli was found to possess considerably higher C20-22 n-3 fatty acids during these seasons along with balancedn-3/n-6 (>2) and polyunsaturated/saturated fatty acid ratio (≥1) than those in pre-monsoon. Greater hypocholesterolemic/hypercholesterolemic ratio (>2.4) and lesser atherogenicity (<1.8) and thrombogenicity (<0.3) indices qualify P. sewelli anideal health food. This study comprises the first report on fatty acid profile from commercially important deep-sea whiplobster P. sewelli.\u0000Keywords: Atherogenicity index, Non-conventional resource, Polyunsaturated fatty acid, Seafood benefits, Thrombogenicity index","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42385707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.126260-04
B. Setyadji, Hety Hartaty
The tropical area of the north-eastern Indian Ocean has historically been a prominent fishing ground for yellowfin tunaThunnus albacares (Bonnaterre, 1788). However, low effort from either Japanese or Taiwanese fleet in the last two decadeshas driven some uncertainties in relative abundance estimates of yellowfin tuna, which affects the robustness of the currentstock analysis for an already declined population. Hence this study was carried out to bridge the research gap by utilising theIndonesian scientific observer data from 2006-2021, which covers the north-eastern Indian Ocean. A delta-lognormal modelwas adopted to fit the data, with the catch per unit effort as the response variable and year, quarter, moon phase, latitudeand longitude as known covariates. The optimal model was chosen using a backward method based on Akaike InformationCriterion (AIC) (Akaike, 1974), Bayesian Information Criterion (BIC) (Schwarz, 1978) and the values of the coefficientof determination (R2). In general, the relative abundance of yellowfin tuna remained at a very low level, with an apparentdeclining trend in the first decade, followed by a slight sign of recovery in the past three years. However, the increasing trendwas overshadowed by uncertainties, likely caused due to natural variation and low coverage in some years. Although theseries was considered short, it managed to picture the dynamics of the abundance of yellowfin tuna in the tropical area of thenorth-eastern Indian Ocean, which is essential for conducting a more robust harvest strategy evaluation. Keywords: Declining stock, Fisheries-independent data, Highly migratory, Relative abundance, Scientific observer
{"title":"Relative abundance of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in the tropical area of the north-eastern Indian Ocean","authors":"B. Setyadji, Hety Hartaty","doi":"10.21077/ijf.2022.69.4.126260-04","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.126260-04","url":null,"abstract":" The tropical area of the north-eastern Indian Ocean has historically been a prominent fishing ground for yellowfin tunaThunnus albacares (Bonnaterre, 1788). However, low effort from either Japanese or Taiwanese fleet in the last two decadeshas driven some uncertainties in relative abundance estimates of yellowfin tuna, which affects the robustness of the currentstock analysis for an already declined population. Hence this study was carried out to bridge the research gap by utilising theIndonesian scientific observer data from 2006-2021, which covers the north-eastern Indian Ocean. A delta-lognormal modelwas adopted to fit the data, with the catch per unit effort as the response variable and year, quarter, moon phase, latitudeand longitude as known covariates. The optimal model was chosen using a backward method based on Akaike InformationCriterion (AIC) (Akaike, 1974), Bayesian Information Criterion (BIC) (Schwarz, 1978) and the values of the coefficientof determination (R2). In general, the relative abundance of yellowfin tuna remained at a very low level, with an apparentdeclining trend in the first decade, followed by a slight sign of recovery in the past three years. However, the increasing trendwas overshadowed by uncertainties, likely caused due to natural variation and low coverage in some years. Although theseries was considered short, it managed to picture the dynamics of the abundance of yellowfin tuna in the tropical area of thenorth-eastern Indian Ocean, which is essential for conducting a more robust harvest strategy evaluation.\u0000Keywords: Declining stock, Fisheries-independent data, Highly migratory, Relative abundance, Scientific observer","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43051898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.117003-14
Khemraj Bunkar, S. Prakash, V. Ramasubramanian, M. Krishnan, N. Kumar
The innovative corporate social responsibility (CSR) initiative of Lupin Human Welfare and Research Foundation, Bharatpur, Rajasthan, India, through fish farming in Kaman Block of Bharatpur has transformed the lives of the local population. Fish farming started with 240 families in 1980, is now benefiting 2000 people and has brought economic and social transformation in this region. Cost-benefit analysis indicated that fish farmers culturing Indian major carps (IMC) for 18 months from spawn to table size registered a benefit-cost ratio (BCR) of 2.15. The fish farmers who cultured IMC for 12 months (from fingerlings to table size ) achieved a BCR of 1.77. The results of data envelopment analysis (DEA) showed that the technical efficiency was around 0.95, indicating highly efficient farms. Polluted water, disruption in power supply and poaching were found to be major constraints faced by the farmers. Keywords: Constraint analysis, Costs and returns analysis, Data envelopment analysis, Indian major carps
{"title":"Economic efficiency analysis of fish farming in Bharatpur District, Rajasthan: A corporate social responsibility (CSR) initiative","authors":"Khemraj Bunkar, S. Prakash, V. Ramasubramanian, M. Krishnan, N. Kumar","doi":"10.21077/ijf.2022.69.4.117003-14","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.117003-14","url":null,"abstract":"The innovative corporate social responsibility (CSR) initiative of Lupin Human Welfare and Research Foundation, Bharatpur, Rajasthan, India, through fish farming in Kaman Block of Bharatpur has transformed the lives of the local population. Fish farming started with 240 families in 1980, is now benefiting 2000 people and has brought economic and social transformation in this region. Cost-benefit analysis indicated that fish farmers culturing Indian major carps (IMC) for 18 months from spawn to table size registered a benefit-cost ratio (BCR) of 2.15. The fish farmers who cultured IMC for 12 months (from fingerlings to table size ) achieved a BCR of 1.77. The results of data envelopment analysis (DEA) showed that the technical efficiency was around 0.95, indicating highly efficient farms. Polluted water, disruption in power supply and poaching were found to be major constraints faced by the farmers. Keywords: Constraint analysis, Costs and returns analysis, Data envelopment analysis, Indian major carps","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43083316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.126804-10
Krishna Moorthy Abarna, V. Rani, P. Padmavathy, P. Jawahar, A. Uma, C. Kalidas
Enzymatically hydrolysed seaweed products (EHSPs) prepared from the red seaweed, Gracilaria corticata (EHSP-1) and brown seaweed, Stoechospermum marginatum (EHSP-2) contained abundant levels of macro, micro and trace elements necessary to fulfil the nutritional requirement of the microalga Nannochloropsis salina. EHSP-1 had higher levels of N, P, K and Fe in comparison with EHSP-2. The growth performance of N. salina suggests that EHSP-1 was more efficient than EHSP-2. The growth rate of N. salina in EHSP-1 was 1.07 times higher than the control whereas in EHSP-2 the growth rate was 0.58 times lower than the control. The maximum biomass concentration of N. salina was achieved in EHSP-1 and EHSP-2 were 0.37 and 0.21 g l-1 with a biomass productivity of 0.027 and 0.0152 g l-1 d-1 respectively. The results of biochemical analyses also suggest that protein, pigment and lipid yield of N. salina was positively stimulated by EHSP. The findings suggest that the best concentration of EHSP-1 and EHSP-2 to achieve maximum biomass and lipid production of the marine microalga N. salina were 8 and 4% respectively. EHSP-1 enhanced the biomass and lipid production without affecting the nutritional properties of N. salina suggesting its potential applicability in aquaculture, biofuel and other related industrial sectors.Keywords: Cellulase enzyme, Indigenous seaweed resources, Nannochloropsis salina, Nutrient rich media
{"title":"Potential of enzymatically hydorlysed seaweed products as cost-effective nutrient media for growth and lipid enhancement in the marine microalga Nannochloropsis salina","authors":"Krishna Moorthy Abarna, V. Rani, P. Padmavathy, P. Jawahar, A. Uma, C. Kalidas","doi":"10.21077/ijf.2022.69.4.126804-10","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.126804-10","url":null,"abstract":"Enzymatically hydrolysed seaweed products (EHSPs) prepared from the red seaweed, Gracilaria corticata (EHSP-1) and brown seaweed, Stoechospermum marginatum (EHSP-2) contained abundant levels of macro, micro and trace elements necessary to fulfil the nutritional requirement of the microalga Nannochloropsis salina. EHSP-1 had higher levels of N, P, K and Fe in comparison with EHSP-2. The growth performance of N. salina suggests that EHSP-1 was more efficient than EHSP-2. The growth rate of N. salina in EHSP-1 was 1.07 times higher than the control whereas in EHSP-2 the growth rate was 0.58 times lower than the control. The maximum biomass concentration of N. salina was achieved in EHSP-1 and EHSP-2 were 0.37 and 0.21 g l-1 with a biomass productivity of 0.027 and 0.0152 g l-1 d-1 respectively. The results of biochemical analyses also suggest that protein, pigment and lipid yield of N. salina was positively stimulated by EHSP. The findings suggest that the best concentration of EHSP-1 and EHSP-2 to achieve maximum biomass and lipid production of the marine microalga N. salina were 8 and 4% respectively. EHSP-1 enhanced the biomass and lipid production without affecting the nutritional properties of N. salina suggesting its potential applicability in aquaculture, biofuel and other related industrial sectors.Keywords: Cellulase enzyme, Indigenous seaweed resources, Nannochloropsis salina, Nutrient rich media","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44725573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.87241-19
A. Furoida, Ika Suciati, I. Susilowati, Made Ika Prastyadewi
The study examined the job preferences of coastal communities between the fisheries sector, traditional textile industry (Batik printing) or other sectors in the Wonokerto-Pekalongan District, Indonesia. Data collected based on interviews with informants were analysed with Atlas Ti software to build triangulation from qualitative data. The results indicated that the coastal communities prefer to work in other sectors because it is more formal and stable compared to the fisheries sector.Keywords: Atlas Ti, Batik, Fisheries, Job selection, Pekalongan
{"title":"Job preferences between fisheries and other sectors in coastal region of Pekalongan, Indonesia","authors":"A. Furoida, Ika Suciati, I. Susilowati, Made Ika Prastyadewi","doi":"10.21077/ijf.2022.69.4.87241-19","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.87241-19","url":null,"abstract":"The study examined the job preferences of coastal communities between the fisheries sector, traditional textile industry (Batik printing) or other sectors in the Wonokerto-Pekalongan District, Indonesia. Data collected based on interviews with informants were analysed with Atlas Ti software to build triangulation from qualitative data. The results indicated that the coastal communities prefer to work in other sectors because it is more formal and stable compared to the fisheries sector.Keywords: Atlas Ti, Batik, Fisheries, Job selection, Pekalongan","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44413535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.126337-09
Meenu Devassykutty, Boby Ignatius, V. P., S. Ebeneezar, P. Sawant, Babitha rani A. M., E. Varghese, S. P., Sajina K.A
A 60-day feeding trial was conducted to study the effect of dietary supplementation of tryptophan in juvenile silver pompanoTrachinotus blochii (Lacepede, 1801) (Average initial weight=6.81±0.05 g). Five isonitrogenous and isolipidic feedssupplemented with tryptophan at different levels, 0 (TRP0), 0.5 (TRP0.5), 1.0 (TRP1.0), 1.5 (TRP1.5) and 2.0 (TRP2.0) g 100 g-1of diets were formulated. The weight gain%, specific growth rate, hepato-somatic index, digestives enzymes of stomach andintestine except protease activity in stomach, red blood cells, white blood cells, crude protein, fat and ash content of the fishwere significantly influenced (p<0.05) by tryptophan supplementation. The viscero-somatic index, intraperitoneal fat ratio,muscle ratio, protease activity in the stomach and acid insoluble ash were unaffected by the treatment. Best observations interms of growth, body composition and digestive enzyme activity among the treatments were obtained in the fish group fedwith tryptophan at a level of 0.5 g 100 g-1 feed. From the current observations it can be concluded that supplementation oftryptophan at the rate of 0.5 g 100 g-1 diet can positively influence the growth of T. blochii. Keywords: Essential amino acids, Growth, Silver pompano, Tryptophan
为研究在初始平均体重为6.81±0.05 g的斑点鲳鲹(Lacepede, 1801)幼鱼饲料中添加色氨酸的效果，配制5种等氮等脂饲料，分别添加0 (TRP0)、0.5 (TRP0.5)、1.0 (TRP1.0)、1.5 (TRP1.5)和2.0 (TRP2.0) g- 100 g-1的色氨酸。添加色氨酸显著影响了鱼的增重%、特定生长率、肝体指数、除胃蛋白酶活性外的胃和肠消化酶、红细胞、白细胞、粗蛋白质、脂肪和灰分含量(p<0.05)。脏体指数、腹腔脂肪比、肌肉比、胃蛋白酶活性和酸不溶性灰分均不受处理影响。色氨酸饲喂水平为0.5 g 100 g-1的组在生长、体组成和消化酶活性方面表现最佳。从目前的观察可以得出结论，以0.5 g 100 g-1的速度添加色氨酸可以积极影响blochi的生长。关键词:必需氨基酸，生长，鲳鱼银，色氨酸
{"title":"Effect of dietary tryptophan supplementation on growth, body composition and digestive enzymes activity of juvenile silver pompano Trachinotus blochii (Lacepede, 1801)","authors":"Meenu Devassykutty, Boby Ignatius, V. P., S. Ebeneezar, P. Sawant, Babitha rani A. M., E. Varghese, S. P., Sajina K.A","doi":"10.21077/ijf.2022.69.4.126337-09","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.126337-09","url":null,"abstract":" A 60-day feeding trial was conducted to study the effect of dietary supplementation of tryptophan in juvenile silver pompanoTrachinotus blochii (Lacepede, 1801) (Average initial weight=6.81±0.05 g). Five isonitrogenous and isolipidic feedssupplemented with tryptophan at different levels, 0 (TRP0), 0.5 (TRP0.5), 1.0 (TRP1.0), 1.5 (TRP1.5) and 2.0 (TRP2.0) g 100 g-1of diets were formulated. The weight gain%, specific growth rate, hepato-somatic index, digestives enzymes of stomach andintestine except protease activity in stomach, red blood cells, white blood cells, crude protein, fat and ash content of the fishwere significantly influenced (p<0.05) by tryptophan supplementation. The viscero-somatic index, intraperitoneal fat ratio,muscle ratio, protease activity in the stomach and acid insoluble ash were unaffected by the treatment. Best observations interms of growth, body composition and digestive enzyme activity among the treatments were obtained in the fish group fedwith tryptophan at a level of 0.5 g 100 g-1 feed. From the current observations it can be concluded that supplementation oftryptophan at the rate of 0.5 g 100 g-1 diet can positively influence the growth of T. blochii.\u0000Keywords: Essential amino acids, Growth, Silver pompano, Tryptophan","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45858676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.123422-05
K. Kumar, S. S. Swathy, M. P. Rajeeshkumar, N. Saravanane, M. Hashim
A better understanding of the mechanism which connects the morphology of fishes and their ecological performance is a major goal in evolutionary studies. As accepted widely, intra-species polymorphism mostly arises from divergent selection pressures between different environments. The present study sought to understand the functional morphological variations exhibited by Mozambique tilapia Oreochromis mossambicus (Peters, 1852) inhabiting heterogeneous habitats, using functional indices derived from the body. We found that O. mossambicus exhibited clear functional responses to divergent habitats indicating trait-habitat linkages. Fishes differed in three out of fifteen indices compared, which are mainly related to swimming performances. Fishes collected from the river possess more streamlined bodies and achieve higher values in indices related to swimming efficiencies. However, there were no significant intra-species differences in the indices related to feeding between habitats, indicating that functional divergences in O. mossambicus are mainly related to swimming and locomotion. The study confirmed that the morpho-functional variations observed in this species are primarily of selection pressure caused by habitat heterogeneities. The present findings further confirm our understanding of the predictive power of the trait-environment approach and indicate that fishes tend to change their traits related to swimming and foraging with changing ecological conditions of the habitat.Keywords: Cichlids, Ecomorphology, Functional traits, Phenotypic variation, Trophic polymorphism
{"title":"Predicting the functional morphology of lotic and lentic populations of the invasive Mozambique tilapia Oreochromis mossambicus (Peters, 1852)","authors":"K. Kumar, S. S. Swathy, M. P. Rajeeshkumar, N. Saravanane, M. Hashim","doi":"10.21077/ijf.2022.69.4.123422-05","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.123422-05","url":null,"abstract":"A better understanding of the mechanism which connects the morphology of fishes and their ecological performance is a major goal in evolutionary studies. As accepted widely, intra-species polymorphism mostly arises from divergent selection pressures between different environments. The present study sought to understand the functional morphological variations exhibited by Mozambique tilapia Oreochromis mossambicus (Peters, 1852) inhabiting heterogeneous habitats, using functional indices derived from the body. We found that O. mossambicus exhibited clear functional responses to divergent habitats indicating trait-habitat linkages. Fishes differed in three out of fifteen indices compared, which are mainly related to swimming performances. Fishes collected from the river possess more streamlined bodies and achieve higher values in indices related to swimming efficiencies. However, there were no significant intra-species differences in the indices related to feeding between habitats, indicating that functional divergences in O. mossambicus are mainly related to swimming and locomotion. The study confirmed that the morpho-functional variations observed in this species are primarily of selection pressure caused by habitat heterogeneities. The present findings further confirm our understanding of the predictive power of the trait-environment approach and indicate that fishes tend to change their traits related to swimming and foraging with changing ecological conditions of the habitat.Keywords: Cichlids, Ecomorphology, Functional traits, Phenotypic variation, Trophic polymorphism","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46235609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.21077/ijf.2022.69.4.125726-03
T. Deepak, P. Padmavathy, V. Rani, D. Manimekalai, S. Devasena
The present study was undertaken to assess the interrelation between water quality and nutrient status of three reservoirssituated in Tamil Nadu, India. These three reservoirs are managed by the Public Works Department (PWD) with the fisheriesaspects falling under the purview of Tamil Nadu State Fisheries Department. In each reservoir, inflow and outflow sectionswere identified as sampling sites. A total of six sampling sites were fixed and monthly sampling for water and fish wasconducted during the period from October 2019 to June 2020. The various physico-chemical parameters such as temperature,electrical conductivity (EC), total dissolved solids (TDS), total suspended solids (TSS), total volatile solids (TVS), turbidity,DO, pH, alkalinity, hardness, chloride, sulphate, biological oxygen demand (BOD) and chemical oxygen demand (COD)were analysed. Biological parameters like chlorophyll-a and primary production as well as various nutrient parameterswere also analysed in the collected water samples. All the physical and chemical water quality variables showed significantvariation (p<0.05) in their concentrations within various months and between stations. All the water quality parameters wereobserved to be within the prescribed limits. The results indicated under-exploitation of fishes from the reservoirs and suggestways to improve fish yields and livelihood of local fisher community. Keywords: Fish catch, Nutrients, Reservoir, Water quality
{"title":"Water quality parameters and nutrient status of selected reservoirs in Tamil Nadu, India","authors":"T. Deepak, P. Padmavathy, V. Rani, D. Manimekalai, S. Devasena","doi":"10.21077/ijf.2022.69.4.125726-03","DOIUrl":"https://doi.org/10.21077/ijf.2022.69.4.125726-03","url":null,"abstract":" The present study was undertaken to assess the interrelation between water quality and nutrient status of three reservoirssituated in Tamil Nadu, India. These three reservoirs are managed by the Public Works Department (PWD) with the fisheriesaspects falling under the purview of Tamil Nadu State Fisheries Department. In each reservoir, inflow and outflow sectionswere identified as sampling sites. A total of six sampling sites were fixed and monthly sampling for water and fish wasconducted during the period from October 2019 to June 2020. The various physico-chemical parameters such as temperature,electrical conductivity (EC), total dissolved solids (TDS), total suspended solids (TSS), total volatile solids (TVS), turbidity,DO, pH, alkalinity, hardness, chloride, sulphate, biological oxygen demand (BOD) and chemical oxygen demand (COD)were analysed. Biological parameters like chlorophyll-a and primary production as well as various nutrient parameterswere also analysed in the collected water samples. All the physical and chemical water quality variables showed significantvariation (p<0.05) in their concentrations within various months and between stations. All the water quality parameters wereobserved to be within the prescribed limits. The results indicated under-exploitation of fishes from the reservoirs and suggestways to improve fish yields and livelihood of local fisher community.\u0000Keywords: Fish catch, Nutrients, Reservoir, Water quality","PeriodicalId":50372,"journal":{"name":"Indian Journal of Fisheries","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46386711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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